Low-frequency normal modes of the incommensurate structure are discussed using the example of K 2 SeO 4 . The amplitudon and phason branches are calculated and their activity in infrared and Raman spectra is determined. The observed static dielectric anomaly is explained by softening of the infrared-active phason mode when the wavevector of the incommensurate wave approaches its commensurate value.
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Dvořák et al. (1978) studied this question.
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